Epoxy Resin Composite Material Pultrusion Profile Process Selection And Application

Epoxy Resin Composite Material Pultrusion Profile Process Selection & Application

Pultrusion molding process is impregnated with resin glue continuous fiberglass bundles and other continuous reinforcing materials such as glass cloth tape, polyester surface felt, etc. in the traction pulling, through the molding die extrusion, and in the mold and curing oven heat curing molding fiberglass reinforced plastic profiles method. Also known as continuous pultrusion molding process. Mainly produces pipe, rod, profile, plate and other FRP profiles.

The advantages of pultrusion molding process are: simple equipment, low cost, high productivity, easy to form automated production lines, product quality and stability; can give full play to the role of reinforcing materials, high mechanical properties, especially the longitudinal strength and modulus; the effective utilization of raw materials, basically no edge waste; longitudinal and transverse strength of profiles can be adjusted to adapt to the different requirements of the use of the profile; its length can be cut according to the needs of cutting.

Pultruded products with a large number of resins are unsaturated polyester resin, followed by epoxy resin, mainly used for mechanical properties and heat resistance requirements of high products, in addition to vinyl ester resins, phenolic resins, thermoplastic resins and so on. Pultrusion molding process on the resin glue requirements are: low viscosity, easy to penetrate the reinforcing material; gel time is longer (usually require a period of more than 8 hours), fast curing to adapt to the requirements of continuous molding; bonding is good, curing shrinkage is small; good flexibility, products are not easy to produce cracks.

Epoxy resin composite pultruded products raw materials and auxiliary materials

Epoxy resin composite pultruded products, is an important variety of FRP profiles, with excellent strength performance indicators. Commonly used epoxy resin is bisphenol A type epoxy resin such as E-55, E-51, E-44, etc. Commonly used curing agent is high solubility and high melting point of dibasic anhydride and aromatic amines, such as m-phenylenediamine, phthalic anhydride, tetrachlorophenic anhydride, methyl endo-propionyl tetrahydrophthalic anhydride (MNA) and so on, but also can be used in imidazole type curing agent.

In recent years, the mechanical properties of pultruded products, heat resistance, fatigue life and electrical properties, such as the requirements of more and more high, and thus the pultrusion process of special epoxy resin system research is progressing rapidly. Shell developed two epoxy system, EPON 9102/curing agent CA 9150 and EPON 9302/curing agent CA 9350, are bisphenol A-type epoxy resin. Dedicated curing agent CA9150 is a special anhydride, CA9350 is a liquid heterocyclic amine curing agent, has been successfully used in composites automotive leaf springs and pumping rods and so on.

Epoxy resin pultruded products commonly used powder filler SiO2, CaCO3, talc, silica fume, TiO2, etc., fineness 150-300 mesh, dosage of 10-15%; flame retardant in addition to flame retardant resins and flame retardant curing agent, but also can be used in active and inactive flame retardant, such as tetrabromobisphenol A, water-containing alumina and so on; coloring pigments are usually used in inorganic pigment, the amount of 0.5-5%. It should be prepared into solution or paste before use.

Epoxy resin composite pultruded products are mainly used in:

1. The field of electrical engineering is the most applied field at present, and it is one of the focuses of development. Such as transformer air conduit positioning rods, high-voltage insulator mandrels, high-voltage cable protection tubes, cable racks, insulated ladders, insulated rods, poles, rail guards, cable distribution frame, motor parts and so on.

2. Chemical anti-corrosion field is the fastest growing field in recent years. Typical products such as: pipe network support structure, pumping rods, downhole pressure pipeline, wastewater treatment equipment, chemical baffle, chemical, petroleum, paper, metallurgy and other factories within the railing, stairs, flat 3. building structure field is mainly used for light structure, high-level structure of the structure of the superstructure or special-purpose structure. Such as mobile house structure, door and window structure with profiles, trusses, light bridges, railings, tent supports, ceiling structure, large boron structure, etc. 4.

4. Sports and recreation fields such as fishing rods, field hockey sticks, skis, pole vaults, bows and arrows, and so on.

5. Transportation field such as automobile shelves, truck frames, refrigerated compartments, automobile springboards, luggage racks, bumpers, decks, electric train track guards, etc.

6. Energy field mainly used for solar collector bracket, wind turbine blade, oil well conduit, etc.

7. Aerospace field, such as aircraft and spacecraft antenna insulating tube, airship motor parts, aircraft composite I-beam, slot beam and square beam, aircraft tie rods, connecting rods, and so on.

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